Perhaps you should try some spelling variations:
thien van » thi van
cau tren » cu tren, dau tren, ca tren
ban hang » ngan hang
hieu van » lieu va, hieu ve
tham soc » cham soc, tham nuoc, thai son
hang vi » hang va, hanh vi, hang di
soc ban » hoc ban, coc ban, so ban
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
vi cau » va cau, ve cau, di cau

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