Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
vi cau » va cau, ve cau, di cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ma hoi. lieu va cam ((luc van) or (duc van)) hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. lieu va cam ((luc van) OR (duc van)) hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. lieu va cam ((luc van) or (duc van)) hanh vi cau tren*.