Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
khanh lai » khanh luan, thanh lap, thanh loi
va triet » va thiet, va trien, ve triet
xa khanh » xa thanh, van khanh, dat khanh
cac tuc » cac toc, cac tu, cac tac
su sach » so sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
vu sach » vu bach, vu khach
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) y nang ma hoa. hieu ve cac tuc xa khanh lai ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang ma hoa. hieu ve cac tuc xa khanh lai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) y nang ma hoa. hieu ve cac tuc xa khanh lai ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang ma hoa. hieu ve cac tuc xa khanh lai ((cua triet) OR (va triet))*.