Perhaps you should try some spelling variations:
thu tien » thuc tien, thu tieng, thuy tien
hai luom » hai luong, hai muoi, hai huoc
nang mai » nang ma, nang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va
sach ky » sac ky, sach y, sach ty
va hang » van hang, va lang, va hanh
va nang » van nang, da nang, cam nang
dau thu » dau thau, dau tu, dat thu
te sach » toc sach

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 nang mai hoi. ((hieu va) or (hieu qua)) hai luom ((va hang) OR (va nang)) dau thu tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang mai hoi. ((hieu va) OR (hieu qua)) hai luom ((va hang) OR (va nang)) dau thu tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang mai hoi. ((hieu va) or (hieu qua)) hai luom ((va hang) OR (va nang)) dau thu tien".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang mai hoi. ((hieu va) or (hieu qua)) hai luom ((va hang) OR (va nang)) dau thu tien*.