Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hanh dai » hanh tai, hanh dao, vanh dai
hieu va » lieu va, hieu qua
cac hoc » cach hoc, cac hop, bac hoc
va hanh » van hanh, va thanh, va danh
te san » te ban, ke san, tu san
san ky » sang ky, van ky, dan ky
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te san ky ((nang x) or (dang xay)) hoi. hieu va cac hoc va hanh dai ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky ((nang x) OR (dang xay)) hoi. hieu va cac hoc va hanh dai ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: te san ky ((nang x) or (dang xay)) hoi. hieu va cac hoc va hanh dai ((cua te) or (cua tu))*.