Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thuc dan » thuc hanh, hoc dan, thuc vat
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, va tinh, le thanh
nang xa » lang xa, nang ma, mang xa
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
dan ky » van 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: thuc dan ky ((nang xa) or (nang x)) hoi. hieu van cam tuc ((va thanh) OR (ban thanh)) dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuc dan ky ((nang xa) OR (nang x)) hoi. hieu van cam tuc ((va thanh) OR (ban thanh)) dai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuc dan ky ((nang xa) or (nang x)) hoi. hieu van cam tuc ((va thanh) OR (ban thanh)) dai cua tu".
• Adding a wildcard symbol may retrieve word variants: thuc dan ky ((nang xa) or (nang x)) hoi. hieu van cam tuc ((va thanh) OR (ban thanh)) dai cua tu*.