Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
cam hoc » cao hoc, am hoc, cam hoa
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
vi cua » di cua

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