Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nang cai » nang cao, nang tai, nang cap
thai cua » than cua, tai cuc, tri cua
tang tai » hang tai, dung tai, sang tao
ban hanh » ban hang
va hanh » van hanh, va thanh, va danh
vu sach » vu bach, su sach, vu khach
nam luc » nang luc, nhan luc, nam thuc
sach ky » sac ky, sach y, sach ty
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky ((nang cai) or (tang tai)) hoi. hieu van nam luc ((va hanh) or (ban hanh)) thai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang cai) OR (tang tai)) hoi. hieu van nam luc ((va hanh) OR (ban hanh)) thai cua te.
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((nang cai) or (tang tai)) hoi. hieu van nam luc ((va hanh) or (ban hanh)) thai cua te*.