Perhaps you should try some spelling variations:
sang lap » sang tao, sang ma, sang tai
cam truc » cau truc, nam truc, lam 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
doan vi » doan va, don vi, doan thi
truc va » thuc va, thuc vat, trung va
ve cam » ve cham, ve cac, va cam
dan vi » don vi, dan va, gan vi
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 va ((dan vi) OR (doan 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 va ((dan vi) OR (doan 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 va ((dan vi) OR (doan vi)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky sang lap hai. hieu ve cam truc va ((dan vi) OR (doan vi)) cua te*.