Perhaps you should try some spelling variations:
thuat sai » thuat bai, thuat san, thuat cai
lam thuoc » nam thuoc, am thuc, cay thuoc
lam truoc » nam truoc, lam truong, nam thuoc
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
lang ha » long ha
lang xa » dang xay, lang van
sai ky » sac 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 ((lang xa) or (lang ha)) hoi. hieu va ((lam truoc) OR (lam thuoc)) va hanh vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sai ky ((lang xa) OR (lang ha)) hoi. hieu va ((lam truoc) OR (lam thuoc)) va hanh vi hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sai ky ((lang xa) or (lang ha)) hoi. hieu va ((lam truoc) OR (lam thuoc)) va hanh vi hoa viet".
• Adding a wildcard symbol may retrieve word variants: thuat sai ky ((lang xa) or (lang ha)) hoi. hieu va ((lam truoc) OR (lam thuoc)) va hanh vi hoa viet*.