Perhaps you should try some spelling variations:
sang lap » sang tao, sang ma, sang tai
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
lap hai » lap tai, lap lai, lap hoat
tu sach » su sach, te sach, tu cach
ky sang » ky nang, ky dang, ky tang
xuc va » tuc va, luc va, xac va
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: ((tu sach) or (thu sach)) ky sang lap hai. hieu van cam ((xuc va) or (duc va)) dan vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky sang lap hai. hieu van cam ((xuc va) OR (duc va)) dan vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky sang lap hai. hieu van cam ((xuc va) or (duc va)) dan vi cua te*.