Perhaps you should try some spelling variations:
sang lap » sang tao, sang tai, dan lap
su sach » so sach, vu sach
doan vi » doan va, don vi, doan thi
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, cam tu, nam thuc
dan vi » don vi, dan va, gan vi
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
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 ky ((sang lap) or (sang ma)) hai. hieu ve cam tuc va ((dan vi) OR (doan vi)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((sang lap) OR (sang ma)) hai. hieu ve cam tuc va ((dan vi) OR (doan vi)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((sang lap) or (sang ma)) hai. hieu ve cam tuc va ((dan vi) OR (doan vi)) cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((sang lap) or (sang ma)) hai. hieu ve cam tuc va ((dan vi) OR (doan vi)) cua te*.