Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
ve triet » va trien, su 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
ve cac » va cac
vi ve » va ve, gi ve, ve ve

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