Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
cao suc » cao su, cao duc
sang ma » tang ma, nang ma, sang tao
vai cua » dai cua, hai cua, lai cua
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 ty ((sang ma) or (lang xa)) hoi. hieu qua ((giao duc) or (cao suc)) van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ty ((sang ma) OR (lang xa)) hoi. hieu qua ((giao duc) OR (cao suc)) van hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty ((sang ma) or (lang xa)) hoi. hieu qua ((giao duc) or (cao suc)) van hanh vai cua tre*.