Perhaps you should try some spelling variations:
xach tay » canh tay
danh yen » danh tuyen, dan huyen, danh kien
sach tu » sach thu, cach tu, sach ty
cao hoc » co hoc, cho hoc, chat hoc
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
va danh » va dinh, va dan, va hanh
yen cua » ben cua, gen cua, men cua
cua tre » cua te, cuu tre, cua triet
tac va » tac da, tac xa, tuc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((xach tay) or (sach tu)) nang cao hoc. hieu va cac tac va danh yen cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((xach tay) OR (sach tu)) nang cao hoc. hieu va cac tac va danh yen cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((xach tay) or (sach tu)) nang cao hoc. hieu va cac tac va danh yen cua tre*.