Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
thien van » thi van
pham thuc » phap thuc, pham chuc, pham thu
chu tren » cu tren, cau tren, chu trang
hieu van » hieu va, lieu va, hieu ve
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
co sach » bo sach, cuon sach, hoc sach
va chu » va che, va cau, va chi
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ty nang x hoi. ((hieu van) or (thien van)) ((pham thuc) or (nham thuc)) va hanh va chu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ty nang x hoi. ((hieu van) OR (thien van)) ((pham thuc) OR (nham thuc)) va hanh va chu tren.
• Adding a wildcard symbol may retrieve word variants: co sach ty nang x hoi. ((hieu van) or (thien van)) ((pham thuc) or (nham thuc)) va hanh va chu tren*.