Perhaps you should try some spelling variations:
kham tuc » nham thuc, pham thuc, kham cuoc
va hanh » van hanh, va thanh, va danh
vu kham » vu khanh
sach xa » sach dao, sach nha, sach bai
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
hieu vu » hieu va, hieu ve, hieu su
tuc va » thuc va, truc va, tuc xa
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: tu sach xa ((nang xa) or (nang x)) hoi. hieu vu kham tuc va hanh ((vi cua) OR (di cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach xa ((nang xa) OR (nang x)) hoi. hieu vu kham tuc va hanh ((vi cua) OR (di cua)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach xa ((nang xa) or (nang x)) hoi. hieu vu kham tuc va hanh ((vi cua) OR (di cua)) viet".
• Adding a wildcard symbol may retrieve word variants: tu sach xa ((nang xa) or (nang x)) hoi. hieu vu kham tuc va hanh ((vi cua) OR (di cua)) viet*.