Perhaps you should try some spelling variations:
thuoc sach » hoc sach, thuat sach, thuoc sinh
nuoc sach » nguoi sach, hoc sach, cuoc cach
dang hai » dang khai, hang hai, dung hai
van dang » van dong, van dung, van nang
nuoc van » nuoc va, nuoc san, luoc van
bac nuoc » cac nuoc, bach tuoc, sach nuoc
thi van » thi lan, thi hanh, thi nang
hai cua » thai cua, dai cua, hoi cua
van bac » van ban, van bao, van hac
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) OR (nuoc sach)) y ((nang xa) or (lang xa)) hoi. thi van bac nuoc van dang hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (nuoc sach)) y ((nang xa) OR (lang xa)) hoi. thi van bac nuoc van dang hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) OR (nuoc sach)) y ((nang xa) or (lang xa)) hoi. thi van bac nuoc van dang hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) OR (nuoc sach)) y ((nang xa) or (lang xa)) hoi. thi van bac nuoc van dang hai cua tre*.