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