Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ve triet » va trien, su triet
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
cac luc » coc luc, cac nuoc, cac cuoc
cau luc » cau truc, cau phuc
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
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)) ky nang ma hoi. hieu va ((cac luc) or (cau luc)) va hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (vu sach)) ky nang ma hoi. hieu va ((cac luc) OR (cau luc)) va hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (vu sach)) ky nang ma hoi. hieu va ((cac luc) or (cau luc)) va hanh vi ve triet*.