Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
dua tren » dung tren
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
vien da » vien dai, hien dai
va hanh » van hanh, va thanh, va danh
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
da duc » dao duc, da duoc, do duc
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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) or (thu sach)) ky nang ma hoi. hieu vien da duc va hanh vai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky nang ma hoi. hieu vien da duc va hanh vai ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky nang ma hoi. hieu vien da duc va hanh vai ((dua tren) or (cua te))*.