Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cua viet » ca viet, hoa viet, cua vat
kham tuc » pham thuc, kham cuoc, tham thuc
va hanh » van hanh, va thanh, va danh
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
vi cua » vai cua, di 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) OR (nham thuc)) va hanh vi 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) OR (nham thuc)) va hanh vi 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) OR (nham thuc)) va hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach xa ((nang xa) or (nang x)) hoi. hieu vu ((kham tuc) OR (nham thuc)) va hanh vi cua viet*.