Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vu khach » vu khanh, vu khac, vay khach
cam truc » cau truc, nam truc, lam truoc
vu sach » vu bach, su sach
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
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: ((vu sach) or (vu khach)) ky nang x ho. hieu va cam truc va hanh vi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang x ho. hieu va cam truc va hanh vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu khach)) ky nang x ho. hieu va cam truc va hanh vi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khach)) ky nang x ho. hieu va cam truc va hanh vi ((cua tre) OR (cua triet))*.