Perhaps you should try some spelling variations:
te sach » toc sach
sach ty » sach y, sach tu, sach thu
va danh » va dinh, va hanh, dia danh
va chat » van chat, va phat, cao chat
va cham » va tham
cao hoi » cau hoi, co hoi, cao hoc
ty nang » ky nang, ty xang, ty hang
va dan » ca dan, va dao, va dau
du cua » duy cua, dau cua, dum 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: te sach ty nang cao hoi. hieu ((va cham) or (va chat)) xuc ((va danh) OR (va dan)) du cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang cao hoi. hieu ((va cham) OR (va chat)) xuc ((va danh) OR (va dan)) du cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang cao hoi. hieu ((va cham) or (va chat)) xuc ((va danh) OR (va dan)) du cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang cao hoi. hieu ((va cham) or (va chat)) xuc ((va danh) OR (va dan)) du cua te*.