Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
nhan luc » nang luc
su sach » so sach, vu sach
doi cua » dai cua, hoi cua
hieu va » lieu va, hieu qua
va nhan » van nhan, ca nhan, va phan
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
luc va » duc va, tuc va, loc va
di cua » dai cua, de cua, do cua

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) or (te sach)) ky lang xa hoi. hieu va nhan luc va thanh ((di cua) OR (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky lang xa hoi. hieu va nhan luc va thanh ((di cua) OR (doi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky lang xa hoi. hieu va nhan luc va thanh ((di cua) OR (doi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky lang xa hoi. hieu va nhan luc va thanh ((di cua) OR (doi cua)) tre*.