Perhaps you should try some spelling variations:
nhan dien » nhan vien, nhan dieu, nhan dan
dien cua » dieu cua, dien cuc, dien cu
te sach » toc sach
luu van » cuu van, luan van, luu hanh
luc van » luoc van, duc van, luc va
hieu va » lieu va, hieu qua
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
cua tuc » cua duc, cua tu, cua thuoc
sach 2 » sach y

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach 2 ((nang ma) OR (tang ma)) hoi. hieu va cac ((luc van) or (luu van)) nhan dien cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach 2 ((nang ma) OR (tang ma)) hoi. hieu va cac ((luc van) OR (luu van)) nhan dien cua tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach 2 ((nang ma) OR (tang ma)) hoi. hieu va cac ((luc van) or (luu van)) nhan dien cua tuc".
• Adding a wildcard symbol may retrieve word variants: te sach 2 ((nang ma) OR (tang ma)) hoi. hieu va cac ((luc van) or (luu van)) nhan dien cua tuc*.