Perhaps you should try some spelling variations:
nhan luc » nang luc
doan vi » doan va, don vi, doan thi
hieu ve » hieu va, hieu van
ve nhan » ve nha, de nhan, va nhan
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
sach v » sach va, sach 2, sach vay
luc va » duc va, tuc va, loc va
dan vi » don vi, dan va, gan vi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach y)) nang ma hoi. hieu ve nhan luc va ((dan vi) OR (doan vi)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) or (sach y)) nang ma hoi. hieu ve nhan luc va ((dan vi) OR (doan vi)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang ma hoi. hieu ve nhan luc va ((dan vi) OR (doan vi)) cuu tre*.