Perhaps you should try some spelling variations:
nhieu vien » nhieu viec, nhiet dien, thieu nien
trinh ve » trinh he, trinh va, trinh vi
vien cac » vien bach, vien dai, vien da
cua tre » cuu tre, cua triet, dua tren
duc lap » doc lap, duc lai, duc lam
cac duc » cac du, cao duc, cac dac
tu sach » thu sach, te sach, tu cach
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
su sach » so sach, vu sach
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: ((tu sach) or (su sach)) ky tang ma hoi. nhieu vien cac duc lap trinh ve ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky tang ma hoi. nhieu vien cac duc lap trinh ve ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky tang ma hoi. nhieu vien cac duc lap trinh ve ((cua tre) or (cua te))*.