Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, dua tren
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
sach ky » sac ky, sach y, sach ty
tai hai » thi hai, dai hai, tai ha
tai hoi » tai khoi, dai hoi, tai hoe
luc va » duc va, tuc va, loc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang ((tai hoi) OR (tai hai)). hieu van cam luc va hanh hai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ((tai hoi) OR (tai hai)). hieu van cam luc va hanh hai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang ((tai hoi) OR (tai hai)). hieu van cam luc va hanh hai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ((tai hoi) OR (tai hai)). hieu van cam luc va hanh hai ((cua tre) or (cua te))*.