Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
nang dao » nang cao, nang dau, nang tao
hieu van » hieu va, lieu va, hieu ve
va triet » va thiet, va trien, ve triet
ty hang » ly hang, ty xang, thi hang
dai hoi » dai hoc, dai hai, dai moi
cam tuc » cam xuc, cam tu, nam thuc
va nang » van nang, da nang, cam nang
ty nang » ky nang, ty xang, ly nang
tuc va » thuc va, truc va, tuc xa
dao va » dao van, tao va, do va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ty nang) or (ty hang)) dai hoi. ((hieu van) or (thien van)) cam tuc va nang dao va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ty hang)) dai hoi. ((hieu van) OR (thien van)) cam tuc va nang dao va triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) or (ty hang)) dai hoi. ((hieu van) or (thien van)) cam tuc va nang dao va triet*.