Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
xuc van » duc van, luc van, vuc van
nang xa » nang x, lang xa, mang xa
ve cac » va cac, vien cac
vi su » va su, ve su, ki su

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 (nang ma)) hoi. hieu ((ve cac) or (vien bach)) xuc van hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang xa) OR (nang ma)) hoi. hieu ((ve cac) OR (vien bach)) xuc van hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang xa) or (nang ma)) hoi. hieu ((ve cac) or (vien bach)) xuc van hanh vi su triet*.