Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
hanh lai » hanh lam, hanh tai, thanh lap
vien cac » vien bach, vien dai, vien da
toc sach » hoc sach, doc sach, thuoc sach
tang ma » mang may, tang van
sach tu » sach thu, cach tu, sach ty
luc van » luoc van, luu van, duc van
xuc ban » duc ban, cuc ban, quoc ban
nang ma » sang ma, nang cao, mang may
lai cua » dai cua, hai cua, lai chau
cua tu » cua tuc, cua su, cua cu

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

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