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