Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thien van » thi van
su triet » su tien, ve triet
lang van » dang van, tang van, hoang van
va hanh » van hanh, va thanh, va danh
hac loc » hau loc, thac toc
van hac » van hoc, van ha, van hai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
su viet » so viet
loc va » hoc va, luc va

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 van)) hoi. thien van hac loc va hanh vi ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang xa) OR (lang van)) hoi. thien van hac loc va hanh vi ((su triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang xa) or (lang van)) hoi. thien van hac loc va hanh vi ((su triet) or (su viet))*.