Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, thien van, lieu va
cam tuc » cam xuc, cam tu, nam thuc
tai cua » thai cua, tai cuc, tri cua
sach ty » sach y, sach tu, sach thu
nang xa » lang xa, nang ma, mang xa
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach kem
van cam » van nam, van lam, van cau
tuc va » thuc va, truc va, tuc xa
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: doc ((sach ky) OR (sach ty)) ((nang xa) or (nang x)) hoi. hieu van cam tuc va hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach ky) OR (sach ty)) ((nang xa) OR (nang x)) hoi. hieu van cam tuc va hanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((sach ky) OR (sach ty)) ((nang xa) or (nang x)) hoi. hieu van cam tuc va hanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: doc ((sach ky) OR (sach ty)) ((nang xa) or (nang x)) hoi. hieu van cam tuc va hanh tai cua te*.