Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
manh hai » lanh hai, minh hai, thanh hai
tu sach » thu sach, su sach, te sach
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
vien da » vien dai, hien dai
va manh » van manh, va danh, va hanh
cua tre » cuu tre, cua triet, dua tren
da tao » dao tao, de tao, da bao
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 (vu sach)) ky nang xa hoi. hieu vien da tao va manh hai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang xa hoi. hieu vien da tao va manh hai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu sach)) ky nang xa hoi. hieu vien da tao va manh hai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang xa hoi. hieu vien da tao va manh hai ((cua tre) OR (cua te))*.