Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
he va » che va, he van, te va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang xa hoi. hieu ve cac he va danh va ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu ve cac he va danh va ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu ve cac he va danh va ((cua triet) or (va triet))*.