Perhaps you should try some spelling variations:
hau truc » cau truc, hang truc, hoc truc
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
cua tre » cua te, cua triet, dua tren
hanh de » hanh ve, hanh kem
cuu tre » cau tren, cau treo
van hau » van ha, van hai, van dau
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
te sai » te bai, te lai, te hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sai) or (te tai)) ky lang xa hoi. hieu van hau truc van hanh de ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sai) OR (te tai)) ky lang xa hoi. hieu van hau truc van hanh de ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((te sai) or (te tai)) ky lang xa hoi. hieu van hau truc van hanh de ((cua tre) or (cuu tre))*.