Perhaps you should try some spelling variations:
dang xay » dang van, van xay
chat huu » pham huu
te sach » toc sach
cua tre » cuu tre, cua triet, dua tren
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
huu va » cuu va, tuu va
cua te » cua tu

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 ma) or (dang xay)) hoi. hieu va chat huu va hanh di ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang ma) OR (dang xay)) hoi. hieu va chat huu va hanh di ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang ma) or (dang xay)) hoi. hieu va chat huu va hanh di ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang ma) or (dang xay)) hoi. hieu va chat huu va hanh di ((cua tre) OR (cua te))*.