Perhaps you should try some spelling variations:
tham nuoc » thay nuoc, thoat nuoc, nha nuoc
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
hanh lai » hanh lam, hanh tai, thanh lap
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
co hoi » co hoc, co loi

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 ((cau hoi) or (co hoi)). hieu van tham nuoc va hanh lai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((cau hoi) OR (co hoi)). hieu van tham nuoc va hanh lai ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((cau hoi) or (co hoi)). hieu van tham nuoc va hanh lai ((cua tre) OR (cua triet))*".