Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
te sach » toc sach
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
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) OR (v nang)) co 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) OR (v nang)) co 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) OR (v nang)) co 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) OR (v nang)) co hoc. hieu ve am thuc ((va hanh) or (va thanh)) dai su triet*.