Perhaps you should try some spelling variations:
luat danh » luat doanh, luat canh, luan danh
hau tren » dau tren, cau tren, thai tren
hieu van » hieu va, thien van, lieu va
luat dan » luat dat, luat doanh, cua dan
cam thuc » am thuc, nam thuc, cam thu
hai hau » hai chau, dai hau, hai hai
su sach » so sach
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
vu sach » vu bach, vu khach
van cam » van nam, van lam, van cau
ma hoi » mai hoi, xa hoi, ma hoa

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)) ly nang ma hoi. hieu van cam thuc ((luat danh) or (luat dan)) hai hau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ly nang ma hoi. hieu van cam thuc ((luat danh) OR (luat dan)) hai hau tren.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ly nang ma hoi. hieu van cam thuc ((luat danh) or (luat dan)) hai hau tren*.