Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
truc ban » thuc ban, truc dan, truc van
nam truc » nam truoc, nam thuc, nam trung
may nong » may cong, mo nong, tay nung
may nang » ky nang, cam nang, cao nang
qua nam » quan nam, cua nam, quang nam
vu sach » vu bach, su sach, vu khach
vi hoa » voi hoa, va hoa, bi hoa
vi hoc » li hoc, va hoc

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((may nang) OR (may nong)) xa hoi. hieu qua nam truc ban thanh ((vi hoa) OR (vi hoc)) viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((may nang) or (may nong)) xa hoi. hieu qua nam truc ban thanh ((vi hoa) OR (vi hoc)) viet~".
• Adding a wildcard symbol may retrieve word variants: vu sach ((may nang) or (may nong)) xa hoi. hieu qua nam truc ban thanh ((vi hoa) OR (vi hoc)) viet*.