Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hang cau » hang dau, hang ca, nhung cau
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
ve triet » va trien, su triet
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
va hanh » van hanh, va thanh, va danh
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 ly hang cau hoi. hieu van nam thuc ((va hanh) or (ban thanh)) vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly hang cau hoi. hieu van nam thuc ((va hanh) OR (ban thanh)) vi ve triet.
• Adding a wildcard symbol may retrieve word variants: su sach ly hang cau hoi. hieu van nam thuc ((va hanh) or (ban thanh)) vi ve triet*.