Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cham tuc » nham thuc, tham thuc, cham soc
nang tai » hang tai, tang tai, sang tai
hieu van » hieu va, thien van, hieu ve
danh va » doanh va, hanh va, anh va
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
tai hoi » tai khoi, dai hoi, tai hai
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ca cua

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