Perhaps you should try some spelling variations:
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
hieu va » lieu va, hieu qua
bac hoc » bai hoc, bac ho
va hanh » van hanh, va thanh, va danh
tu sac » tu sach, tu san, tu bac
va bac » van bac, va cac, va bai
vi cua » vai cua, di cua
cua te » cua tu

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

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