Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
hang tai » hang va, dung tai
lang tai » lang thai, tang tai, sang tai
tu sach » thu sach, su sach, te sach
dai tuc » dai thuc, dai truc, dao tuc
nang ma » tang ma, sang ma, nang cao
vu sach » vu bach, su sach, vu khach
tuc va » thuc va, truc va, tuc xa
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (vu sach)) ky nang ma hoa. hieu vien dai tuc va ((lang tai) or (hang tai)) cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang ma hoa. hieu vien dai tuc va ((lang tai) OR (hang tai)) cua su.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang ma hoa. hieu vien dai tuc va ((lang tai) or (hang tai)) cua su*.