Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
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
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cuu » vi luu, vinh cuu

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) OR (nang luc)) va dan 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) OR (nang luc)) va dan vi cuu tre~".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang ma hoi. hieu ve ((nhan luc) OR (nang luc)) va dan vi cuu tre*.