Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
truoc va » truc va, thuoc va, truong va
toan ky » than ky, toan ke, toan may
nang xa » nang x, lang xa, nang ma
qua lam » cua lam, qua la, qua lao
va hanh » van hanh, va thanh, va danh
vi hoc » li hoc, va hoc
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 ((toan ky) OR (toan ly)) nang xa hoi. hieu qua lam truoc va hanh ((vi hoc) or (va hoa)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((toan ky) OR (toan ly)) nang xa hoi. hieu qua lam truoc va hanh ((vi hoc) OR (va hoa)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((toan ky) OR (toan ly)) nang xa hoi. hieu qua lam truoc va hanh ((vi hoc) or (va hoa)) viet".
• Adding a wildcard symbol may retrieve word variants: thuat ((toan ky) OR (toan ly)) nang xa hoi. hieu qua lam truoc va hanh ((vi hoc) or (va hoa)) viet*.