Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
vu khach » vu khanh, vu khac, vay khach
van hanh » van thanh, ban hanh, van anh
ve triet » va trien, su triet
vu sach » vu bach, su sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
ve cac » va cac, vien 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: ((toc sach) OR (((vu sach) OR (vu khach)))) ky nang xa hoi. hieu ve cac luc van hanh vi ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (((vu sach) OR (vu khach)))) ky nang xa hoi. hieu ve cac luc van hanh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (((vu sach) OR (vu khach)))) ky nang xa hoi. hieu ve cac luc van hanh vi ve triet*.