Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
hoc nganh » hoc nhanh
ky lang » ky dang, ky tang, tay lang
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vi cau » ve cau, di cau, viet cau
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc nganh ((ky lang) or (ky nang)) xa hoi. hieu ve cham thuc va hanh ((vi cau) OR (va cau)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh ((ky lang) OR (ky nang)) xa hoi. hieu ve cham thuc va hanh ((vi cau) OR (va cau)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nganh ((ky lang) or (ky nang)) xa hoi. hieu ve cham thuc va hanh ((vi cau) OR (va cau)) treo".
• Adding a wildcard symbol may retrieve word variants: hoc nganh ((ky lang) or (ky nang)) xa hoi. hieu ve cham thuc va hanh ((vi cau) OR (va cau)) treo*.