Perhaps you should try some spelling variations:
va duong » van duong, va tuong, va huong
cam thue » cam thu, lam thue, nam thue
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
va dung » van dung, vat dung, va ung
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao

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 y nang xa hoi. hieu va cam thue ((va dung) OR (va duong)) tai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu va cam thue ((va dung) OR (va duong)) tai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu va cam thue ((va dung) OR (va duong)) tai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu va cam thue ((va dung) OR (va duong)) tai ((cua tre) or (cuu tre))*.