Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
nang tai » hang tai, tang tai, sang tai
danh vai » danh sai, doanh van, dang van
hieu van » hieu va, thien van, lieu va
cham tuc » nham thuc, tham thuc, cham soc
su sach » so sach, vu sach
danh va » doanh va, hanh va, anh va
cua tre » cua te, cuu tre, cua triet
tai hoi » tai khoi, dai hoi, tai hai
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach v nang tai hoi. hieu van ((cham tuc) or (pham thuc)) va ((danh vai) or (danh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang tai hoi. hieu van ((cham tuc) OR (pham thuc)) va ((danh vai) OR (danh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach v nang tai hoi. hieu van ((cham tuc) or (pham thuc)) va ((danh vai) or (danh va)) cua tre*.