Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
sang lap » sang tao, sang ma, sang tai
cam truc » cau truc, nam truc, nam truoc
su sach » so sach
vu sach » vu bach, vu khach
ky sang » ky nang, ky dang, ky tang
lap hai » lap tai, lap lai, lap hoat
hieu ve » hieu va, hieu van
vi cua » vai cua, di cua
dan vi » doan vi, don vi, dan va
va dan » ca dan, va dao, va dau
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: ((su sach) or (vu sach)) ky sang lap hai. hieu ve ((cam truc) OR (lam truoc)) va dan vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky sang lap hai. hieu ve ((cam truc) OR (lam truoc)) va dan vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky sang lap hai. hieu ve ((cam truc) OR (lam truoc)) va dan vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky sang lap hai. hieu ve ((cam truc) OR (lam truoc)) va dan vi cua te*.