Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu cach » tu cac
su sach » so sach, vu sach
van cam » van nam, van lam, van cau
la tren » loai tren, dua tren, dat tren
xuc va » duc va, tuc va, luc va
dan vi » doan vi, dan va, gan vi
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (su sach)) ky nang x hoi. hieu van cam xuc va ((dan vi) or (don vi)) la tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ky nang x hoi. hieu van cam xuc va ((dan vi) OR (don vi)) la tren.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ky nang x hoi. hieu van cam xuc va ((dan vi) or (don vi)) la tren*.