Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
nang doc » nang luc
va hanh » van hanh, va danh, ban hanh
te sach » toc sach
hieu ve » hieu va, hieu van
nang co » nang cao, nang noi, nang hoc
dai su » dai sua, dai so, dan su
ve am » va am

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 y ((nang co) OR (nang doc)) hoc. hieu ve am thuc ((va hanh) or (va thanh)) dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang co) OR (nang doc)) hoc. hieu ve am thuc ((va hanh) OR (va thanh)) dai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang co) OR (nang doc)) hoc. hieu ve am thuc ((va hanh) or (va thanh)) dai su triet".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang co) OR (nang doc)) hoc. hieu ve am thuc ((va hanh) or (va thanh)) dai su triet*.