Perhaps you should try some spelling variations:
tam phat » va phat, dao phat, tam than
kem phat » te phat, de phat, ve phat
hieu van » hieu va, thien van, lieu va
van lam » van nam
lam luc » lao luc, lam duoc
va hanh » van hanh, va thanh, va danh
te sach » toc sach
ma hoi » mai hoi, ma hoa, me hoi
sach v » sach va, sach y, sach 2
luc va » duc va, tuc va, loc va
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: te sach v nang ((ma hoi) or (xa hoi)). hieu van lam luc va hanh ((kem phat) OR (tam phat)) trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang ((ma hoi) OR (xa hoi)). hieu van lam luc va hanh ((kem phat) OR (tam phat)) trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang ((ma hoi) or (xa hoi)). hieu van lam luc va hanh ((kem phat) OR (tam phat)) trien".
• Adding a wildcard symbol may retrieve word variants: te sach v nang ((ma hoi) or (xa hoi)). hieu van lam luc va hanh ((kem phat) OR (tam phat)) trien*.