Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dung trung » dung trong, quang trung, dung ung
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
nam tu » nam thu, nam thuc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky ((nang xa) or (lang xa)) hoi. hieu van nam tu va hanh vi ((dung trung) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang xa) OR (lang xa)) hoi. hieu van nam tu va hanh vi ((dung trung) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang xa) or (lang xa)) hoi. hieu van nam tu va hanh vi ((dung trung) or (cua tre))*.