Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
duc van » duc va, duc tan, duc manh
cua tuc » cua duc, cua tu, cua thuoc
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc 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 sac ky ((nang xa) or (lang xa)) hoi. hieu ve chat ((luc va) or (duc van)) thanh dai cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang xa) OR (lang xa)) hoi. hieu ve chat ((luc va) OR (duc van)) thanh dai cua tuc.
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang xa) or (lang xa)) hoi. hieu ve chat ((luc va) or (duc van)) thanh dai cua tuc*.