Perhaps you should try some spelling variations:
duoc hoi » quoc hoi, duoc hoc, duoc si
vao truc » vao thuc, cau truc, dao tuc
ve triet » va trien, su triet
su sach » so sach, vu sach
doc hai » hoc hai, duc hai, do hai
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
va vao » va van, va dao, va bao
vi ve » va ve, gi ve, ve ve

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 ((duoc hoi) or (doc hai)). lieu va vao truc va hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang ((duoc hoi) OR (doc hai)). lieu va vao truc va hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: su sach v nang ((duoc hoi) or (doc hai)). lieu va vao truc va hanh vi ve triet*.