Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
thien van » thi van
danh hai » dang hai, lanh hai, manh hai
thuc dan » thuc hanh, hoc dan, thuc vat
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc day
hai cau » hai chau, hai chu, hai hau
su sach » so sach, vu sach
ma hoi » mai hoi, ma hoa, me hoi

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 nang ((ma hoi) or (xa hoi)). thien van nam ((thuc va) OR (thuc dan)) danh hai cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((ma hoi) OR (xa hoi)). thien van nam ((thuc va) OR (thuc dan)) danh hai cau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((ma hoi) or (xa hoi)). thien van nam ((thuc va) OR (thuc dan)) danh hai cau triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((ma hoi) or (xa hoi)). thien van nam ((thuc va) OR (thuc dan)) danh hai cau triet*.