Perhaps you should try some spelling variations:
thien van » thi van
ban thanh » ban hang
hieu van » hieu va, lieu va, hieu ve
tham soc » cham soc, tham nuoc, thai son
ban hanh » ban hang
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cu tren » tu tren, dua tren
vi cu » vi su, vi xu, vi du

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky lang xa hoi. ((hieu van) or (thien van)) tham soc ((ban thanh) OR (ban hanh)) vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. ((hieu van) OR (thien van)) tham soc ((ban thanh) OR (ban hanh)) vi cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. ((hieu van) or (thien van)) tham soc ((ban thanh) OR (ban hanh)) vi cu tren".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. ((hieu van) or (thien van)) tham soc ((ban thanh) OR (ban hanh)) vi cu tren*.