Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuoc sinh
thuat sach » thuat lanh, thuat san
tinh bai » tinh bac, tinh hai, hinh bai
cham cuu » cap cuu, chat cua
bai cua » ban cua, dai cua, bai ca
cuu may » cuu xay, cau may, chu may
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa

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 (thuat sach)) y ((nang xa) OR (nang x)) hoi. hieu ve cham cuu may tinh bai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuat sach)) y ((nang xa) OR (nang x)) hoi. hieu ve cham cuu may tinh bai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (thuat sach)) y ((nang xa) OR (nang x)) hoi. hieu ve cham cuu may tinh bai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat sach)) y ((nang xa) OR (nang x)) hoi. hieu ve cham cuu may tinh bai cua tre*.