Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
ban hang » ngan hang
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cam tuc » cam xuc, cam tu, dam thuc
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ca cua

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 y nang xa hoi. ((hieu va) or (lieu va)) ((cam tuc) OR (nam thuc)) ban hang va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. ((hieu va) OR (lieu va)) ((cam tuc) OR (nam thuc)) ban hang va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. ((hieu va) or (lieu va)) ((cam tuc) OR (nam thuc)) ban hang va cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((hieu va) or (lieu va)) ((cam tuc) OR (nam thuc)) ban hang va cua triet*.