Perhaps you should try some spelling variations:
cham truc » cau truc, pham thuc, nam truc
nham thuc » nhan thuc, nam thuc, nham thu
so sach » so sanh, bo sach, co sach
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang cao hoi. hieu ve ((cham truc) OR (nham thuc)) gia thanh ((vi cua) or (di cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang cao hoi. hieu ve ((cham truc) OR (nham thuc)) gia thanh ((vi cua) OR (di cua)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang cao hoi. hieu ve ((cham truc) OR (nham thuc)) gia thanh ((vi cua) or (di cua)) viet".
• Adding a wildcard symbol may retrieve word variants: so sach y nang cao hoi. hieu ve ((cham truc) OR (nham thuc)) gia thanh ((vi cua) or (di cua)) viet*.