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