Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam thue » cam thu, lam thue, nam thue
tang tai » hang tai, dung tai, sang tao
cua tre » cua te, cuu tre, dua tren
va tang » va trang, van tang, ha tang
thue va » thuc va, thuyet va, thuc vat
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van 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) OR (v nang)) xa hoi. hieu va cam thue va tang tai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) xa hoi. hieu va cam thue va tang tai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (v nang)) xa hoi. hieu va cam thue va tang tai ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (v nang)) xa hoi. hieu va cam thue va tang tai ((cua tre) or (cua triet))*.