Perhaps you should try some spelling variations:
hac truc » hoc truc, hang truc, sach truc
hieu van » hieu va, thien van, lieu va
su sach » vu sach
cuu tre » cua tre, cau tren, cau treo
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
van hac » van hoc, van ha, van hai
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
so sach » so sanh, bo sach, co sach
cua te » cua tu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty nang xa hoi. hieu van hac truc va hanh va ((cuu tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty nang xa hoi. hieu van hac truc va hanh va ((cuu tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ty nang xa hoi. hieu van hac truc va hanh va ((cuu tre) or (cua te))*.