Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cua viet » ca viet, hoa viet, cua vat
dang van » hoang van, hang va
cham tuc » nham thuc, pham thuc, cham soc
sach ty » sach y, sach tu, sach thu
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
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 ty ((nang xa) or (dang van)) hoi. hieu ve ((cham tuc) OR (tham thuc)) va hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (dang van)) hoi. hieu ve ((cham tuc) OR (tham thuc)) va hanh di cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (dang van)) hoi. hieu ve ((cham tuc) OR (tham thuc)) va hanh di cua viet*".