Perhaps you should try some spelling variations:
doanh thai » doanh tai, doanh thanh, doanh nhan
vay doanh » van doanh, ly doanh, voi doanh
thai cua » than cua, tai cuc, tri cua
nhan luc » nang luc
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
luc vay » luc va, luc van, luoc van
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu vu » hieu ve, hieu su, dieu vu
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang xa) or (nang ma)) hoi. ((hieu vu) OR (hieu va)) nhan luc vay doanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (nang ma)) hoi. ((hieu vu) OR (hieu va)) nhan luc vay doanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) or (nang ma)) hoi. ((hieu vu) OR (hieu va)) nhan luc vay doanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (nang ma)) hoi. ((hieu vu) OR (hieu va)) nhan luc vay doanh thai cua tre*.