Perhaps you should try some spelling variations:
doc sach » hoc sach, nuoc sach, dac sac
nang hoa » nang hoat, hang hoa, nang hoc
va triet » va thiet, va trien, ve triet
toc sach » hoc sach, thuoc sach, nuoc sach
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua te » cua tu
ve cam » ve cham, ve cac, va cam

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 sach)) ky nang hoa hoi. hieu ve cam duc va danh vi ((cua te) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (toc sach)) ky nang hoa hoi. hieu ve cam duc va danh vi ((cua te) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (toc sach)) ky nang hoa hoi. hieu ve cam duc va danh vi ((cua te) or (va triet))*.