Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
ve triet » va trien, su triet
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
cua te » cua tu
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc sach) or (toc san)) ky nang ma hoi. hieu va cam tuc va hanh vi ((cua te) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (toc san)) ky nang ma hoi. hieu va cam tuc va hanh vi ((cua te) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (toc san)) ky nang ma hoi. hieu va cam tuc va hanh vi ((cua te) or (ve triet))*.