Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
pham thuc » phap thuc, pham chuc, nham thuc
cham truc » cau truc, nham thuc, nam truc
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va, hieu van
ky lang » ky dang, ky tang, tay lang
va hanh » van hanh, va thanh, va danh
ha hoi » hoa hoi, ha noi, xa hoi
vi cau » va cau, ve cau, di cau

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