Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hac truc » hoc truc, hang truc, sach truc
su sach » so sach, vu sach
hanh va » hang va, hanh vi
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
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 ty nang xa hoi. ((hieu van) OR (hieu va)) 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 ty nang xa hoi. ((hieu van) OR (hieu va)) hac truc va hanh va ((cuu tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((hieu van) OR (hieu va)) hac truc va hanh va ((cuu tre) or (cua te))*.