Perhaps you should try some spelling variations:
thien van » thi van
vu khach » vu khanh, vu khac, vay khach
hanh hai » thanh hai, nhanh hai, hang hai
hieu van » hieu va, lieu va, hieu ve
su sach » so sach, vu sach
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
lam loc » lam duoc, lam ngoc
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
loc va » hoc va, luc va
cua tu » cua tuc, cua su, cua cu

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 lang xa hoi. ((hieu van) OR (thien van)) lam loc va hanh hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) ky lang xa hoi. ((hieu van) OR (thien van)) lam loc va hanh hai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu khach)) ky lang xa hoi. ((hieu van) OR (thien van)) lam loc va hanh hai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) ky lang xa hoi. ((hieu van) OR (thien van)) lam loc va hanh hai cua tu*.