Perhaps you should try some spelling variations:
su sach » so sach, vu sach
ky sang » ky nang, ky dang, duy sang
ky tang » ky nang, ky dang, kho tang
lap lai » lap tai, lay lai, lam lai
hieu ve » hieu va, hieu van
cac loc » cac lop, cac toc, cac hoc
ve cac » va cac, vien cac
loc va » hoc va, luc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
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: su sach ((ky sang) or (ky tang)) lap lai. hieu ve cac loc va dan vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky sang) OR (ky tang)) lap lai. hieu ve cac loc va dan vi cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky sang) or (ky tang)) lap lai. hieu ve cac loc va dan vi cua te*.