Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
thu sach » tu sach, thuat sach, thuoc sach
hanh dai » hanh tai, hanh dao, vanh dai
tang mai » tang ma, tang tai, lang mai
va hanh » van hanh, va thanh, va danh
cac luc » cau luc, coc luc, cac nuoc
hieu va » lieu va, hieu qua
hieu ve » hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, kho tang
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (thuat san)) ky tang mai hoi. ((hieu ve) or (hieu va)) cac luc va hanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat san)) ky tang mai hoi. ((hieu ve) OR (hieu va)) cac luc va hanh dai cua tu.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat san)) ky tang mai hoi. ((hieu ve) or (hieu va)) cac luc va hanh dai cua tu*.