Perhaps you should try some spelling variations:
dang xay » dang van, van xay
cach hoc » cach thuc, cach thoi, dich hoc
hanh dai » hanh tai, hanh dao, vanh dai
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
ve cac » va cac, vien cac
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: ve cac ky ((nang xa) OR (dang xay)) hoi. hieu va ((cac hop) OR (cach hoc)) va hanh dai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ve cac ky ((nang xa) OR (dang xay)) hoi. hieu va ((cac hop) OR (cach hoc)) va hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: ve cac ky ((nang xa) OR (dang xay)) hoi. hieu va ((cac hop) OR (cach hoc)) va hanh dai cua te*.