Perhaps you should try some spelling variations:
thuc luan » thuoc luan, thuc huan, thue luan
thuc luat » thue luat, thuoc luan, thuc vat
cau tren » cu tren, dau tren, ca tren
danh hai » dang hai, lanh hai, manh hai
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
vu sach » vu bach, vu khach
hai cau » hai chau, hai chu, hai hau
su sach » so sach
ma hoi » mai hoi, xa hoi, ma hoa
van am » van nam, van lam, van dam

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 am ((thuc luat) OR (thuc luan)) danh hai cau 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 am ((thuc luat) OR (thuc luan)) danh hai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ly nang ma hoi. hieu van am ((thuc luat) OR (thuc luan)) danh hai cau tren".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ly nang ma hoi. hieu van am ((thuc luat) OR (thuc luan)) danh hai cau tren*.