Perhaps you should try some spelling variations:
thien van » thi van
vu khach » vu khanh, vu khac, vay khach
hieu van » hieu va, lieu va, hieu ve
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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) or (vu khach)) ky nang xa hoi. ((hieu van) or (thien van)) cau truc va danh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) ky nang xa hoi. ((hieu van) OR (thien van)) cau truc va danh va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) ky nang xa hoi. ((hieu van) or (thien van)) cau truc va danh va cua tre*.