Perhaps you should try some spelling variations:
chat xuc » chat huu, cam xuc, chao xu
tang dai » tang tai, tang dan, lang dai
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
tu sach » thu sach, su sach, te sach
vu chat » va chat, ve chat, du chat
hieu vu » hieu va, hieu ve, hieu su
ky tang » ky nang, ky dang, kho tang
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 sach) or (tu cac)) ky tang dai hoc. hieu vu chat xuc ((va hanh) OR (va danh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (tu cac)) ky tang dai hoc. hieu vu chat xuc ((va hanh) OR (va danh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (tu cac)) ky tang dai hoc. hieu vu chat xuc ((va hanh) OR (va danh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (tu cac)) ky tang dai hoc. hieu vu chat xuc ((va hanh) OR (va danh)) vi cua te*.