Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
dung sai » dung tai, dung va, dung dat
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va dung » van dung, va duong, vat dung
va cam » va cham, va cac, va cao
cua tu » cua tuc, cua su, cua cu

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 ((ky lang) OR (ky nang)) xa hoi. hieu va cam duc va dung sai ((cua triet) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky lang) OR (ky nang)) xa hoi. hieu va cam duc va dung sai ((cua triet) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky lang) OR (ky nang)) xa hoi. hieu va cam duc va dung sai ((cua triet) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky lang) OR (ky nang)) xa hoi. hieu va cam duc va dung sai ((cua triet) or (cua tu))*.