Perhaps you should try some spelling variations:
thien van » thi van
tham nuoc » thay nuoc, thoat nuoc, nha nuoc
hieu van » hieu va, lieu va, hieu ve
hanh tai » thanh tai, hang tai, han tai
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao hoi » cau hoi, co hoi, cao hoc
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet

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 ty nang cao hoi. ((hieu van) or (thien van)) tham nuoc va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang cao hoi. ((hieu van) OR (thien van)) tham nuoc va hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang cao hoi. ((hieu van) or (thien van)) tham nuoc va hanh tai cua tre*.