Perhaps you should try some spelling variations:
lam truc » lam truoc, nam truc, lam thuoc
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va lam » van lam, va lap
sac ky » cac ky
vi hoa » voi hoa, vi hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sai ky) OR (sac ky)) ((lang xa) or (nang x)) hoi. hieu va lam truc va hanh vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sai ky) OR (sac ky)) ((lang xa) OR (nang x)) hoi. hieu va lam truc va hanh vi hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sai ky) OR (sac ky)) ((lang xa) or (nang x)) hoi. hieu va lam truc va hanh vi hoa viet".
• Adding a wildcard symbol may retrieve word variants: thuat ((sai ky) OR (sac ky)) ((lang xa) or (nang x)) hoi. hieu va lam truc va hanh vi hoa viet*.