Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
nang dai » nang dau, nang tai, lang dai
thu sac » thu sach, thu san, thu xac
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
xa nang » da nang, va nang, xa nong
sac ky » cac ky, sai 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: thu sac ky ((nang xa) or (nang ma)) hoi. hieu vu cham tuc xa nang dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky ((nang xa) OR (nang ma)) hoi. hieu vu cham tuc xa nang dai cua tu.
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((nang xa) or (nang ma)) hoi. hieu vu cham tuc xa nang dai cua tu*.