Perhaps you should try some spelling variations:
hang truc » khung truc
hieu van » hieu va, thien van, lieu va
hac truc » hoc truc, sach truc, cau truc
cua tre » cua te, cua triet, dua tren
doan vi » doan va, don vi, doan thi
va doan » va doanh, van doan, va dan
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang xa hoi. hieu van ((hac truc) or (hang truc)) va doan vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu van ((hac truc) OR (hang truc)) va doan vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu van ((hac truc) or (hang truc)) va doan vi ((cua tre) or (cuu tre))*.