Perhaps you should try some spelling variations:
thuoc sach » hoc sach, thuat sach, thuoc sinh
nuoc sach » nguoi sach, hoc sach, cuoc cach
van hanh » van thanh, ban hanh, van anh
cua tre » cuu tre, cua triet, dua tren
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
hanh va » hang va, hanh vi
ve cac » va cac, vien cac
bo van » vo van, so van, do van
cac bo » bac bo, cac co
cua te » cua tu

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)) ky lang xa hoi. hieu ve cac bo van hanh va ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (nuoc sach)) ky lang xa hoi. hieu ve cac bo van hanh va ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (nuoc sach)) ky lang xa hoi. hieu ve cac bo van hanh va ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (nuoc sach)) ky lang xa hoi. hieu ve cac bo van hanh va ((cua tre) OR (cua te))*.