Perhaps you should try some spelling variations:
chat truc » cau truc, chat xuc
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hanh dao » lanh dao, thanh dat, thanh dam
so sach » so sanh, bo sach, co sach
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
dao su » dao suu, dan su, cao su
kien » bien, vien, tien

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thu nang cao hoi. ((hieu ve) or (lieu va)) chat truc va hanh dao su kien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu nang cao hoi. ((hieu ve) OR (lieu va)) chat truc va hanh dao su kien.
• Adding a wildcard symbol may retrieve word variants: so sach thu nang cao hoi. ((hieu ve) or (lieu va)) chat truc va hanh dao su kien*.