Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van hanh » van thanh, ban hanh, van anh
cham xuc » cam xuc, chat xuc, cham soc
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, vuc van
hieu va » hieu qua
tang ha » lang ha, tang ma, trung ha
ky tang » ky nang, ky dang, kho tang
di hoa » dai hoa, doi hoa, do hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuoc sach)) ky tang ha noi. ((hieu va) or (lieu va)) cham xuc van hanh di hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky tang ha noi. ((hieu va) OR (lieu va)) cham xuc van hanh di hoa viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky tang ha noi. ((hieu va) or (lieu va)) cham xuc van hanh di hoa viet*.