Perhaps you should try some spelling variations:
danh kien » dinh kien, danh viet, linh kien
cham hoc » cham soc, chat hoc, cham hoi
kien cuc » dien cuc, kien thuc, kien truc
te sach » toc sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
tai hoi » tai khoi, dai hoi, tai hoe
tai hai » thi hai, dai hai, tai ha
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va danh » va dinh, va dan, va hanh
cuc tre » duc tre, cua tre, cuu tre

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach vu nang ((tai hoi) or (tai hai)). hieu ve cham hoc va danh kien cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach vu nang ((tai hoi) OR (tai hai)). hieu ve cham hoc va danh kien cuc tre.
• Adding a wildcard symbol may retrieve word variants: te sach vu nang ((tai hoi) or (tai hai)). hieu ve cham hoc va danh kien cuc tre*.