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

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 ty ((nang xa) or (nang ma)) hoi. hieu va nhan luc vay doanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang ma)) hoi. hieu va nhan luc vay doanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (nang ma)) hoi. hieu va nhan luc vay doanh tai cua tre*.