Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va thiet, va trien, ve triet
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
dao van » do van, dang van
ve cac » va cac, vien cac
dai va » mai va
ve ca » ve cai, ve cau, ve cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang xa hoi. hieu ((ve ca) or (ve cac)) dao van hanh dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang xa hoi. hieu ((ve ca) OR (ve cac)) dao van hanh dai va triet.
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. hieu ((ve ca) or (ve cac)) dao van hanh dai va triet*.