Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
manh hai » lanh hai, minh hai, thanh hai
danh hai » dang hai, lanh hai, danh hau
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
van cam » van nam, van lam, van dam
van cau » van dau, van hau, van chat
y nang » ky nang, ly nang, v nang
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 y nang ma hoi. hieu ((van cam) OR (van cau)) tuc xa ((danh hai) or (manh hai)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu ((van cam) OR (van cau)) tuc xa ((danh hai) OR (manh hai)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ma hoi. hieu ((van cam) OR (van cau)) tuc xa ((danh hai) or (manh hai)) cau tren".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu ((van cam) OR (van cau)) tuc xa ((danh hai) or (manh hai)) cau tren*.