Perhaps you should try some spelling variations:
thien van » thi van
cau treo » cau theo, cau tren, cau triet
hac thuc » hoc thuc, ha thuc, thach thuc
ly nang » ky nang, ly hang, ly vang
van hac » van hoc, van ha, van hai
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
y nang » ky nang, v nang, may nang
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va

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 ((y nang) or (ly nang)) xa hoi. thien van hac thuc va dan vi ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ly nang)) xa hoi. thien van hac thuc va dan vi ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (ly nang)) xa hoi. thien van hac thuc va dan vi ((cua tre) or (cau treo))*.