Perhaps you should try some spelling variations:
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
vu khac » vu kham, vu khanh, bui khac
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
chat co » thuat co, chat cua, chat deo
vi hoa » voi hoa, va hoa, bi hoa
vi hoc » li hoc, va hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (vu khac)) ky lang xa hoi. hieu va chat co ban hanh ((vi hoa) OR (vi hoc)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu khac)) ky lang xa hoi. hieu va chat co ban hanh ((vi hoa) OR (vi hoc)) viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu khac)) ky lang xa hoi. hieu va chat co ban hanh ((vi hoa) OR (vi hoc)) viet*".