Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
cam truc » cau truc, nam truc, lam truoc
truc va » thuc va, thuc vat, trung va
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
ly nang » ky nang, ly hang, ly vang
y nang » ky nang, v nang, may nang
vi cua » vai cua
di cua » dai cua, doi cua, de cua
ve cam » ve cham, ve cac, va cam

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