Perhaps you should try some spelling variations:
thuoc sai » thuoc tai, thuoc san, thuoc sach
van quan » van ban
van tuan » van ban, anh tuan
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
may hoi » may thoi, tay hoi, mai hoi
ky mang » ky nang, ke mang, ky dang
ve cam » ve cham, ve cac, va cam
sai ky » sac ky
vai va » mai va, hai va, lai va
dai va » mai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sai ky mang may hoi. hieu ve cam luc ((van tuan) OR (van quan)) ((vai va) or (dai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sai ky mang may hoi. hieu ve cam luc ((van tuan) OR (van quan)) ((vai va) OR (dai va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sai ky mang may hoi. hieu ve cam luc ((van tuan) OR (van quan)) ((vai va) or (dai va)) triet".
• Adding a wildcard symbol may retrieve word variants: thuoc sai ky mang may hoi. hieu ve cam luc ((van tuan) OR (van quan)) ((vai va) or (dai va)) triet*.