Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
dang cac » dung cac, bang cac, dong cac
cac khoi » cac thoi, cac khoan, cach thoi
van dung » van dong, xay dung, tin dung
truc van » truc va, thuc van, truc ban
cuu tre » cua tre, cau treo
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
va cham » va chat
ky dang » ky nang, ky danh
va tham » van tham, va thanh, va thuat

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 dang cac khoi. lieu ((va cham) OR (va tham)) truc van dung tai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang cac khoi. lieu ((va cham) OR (va tham)) truc van dung tai ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang cac khoi. lieu ((va cham) OR (va tham)) truc van dung tai ((cuu tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang cac khoi. lieu ((va cham) OR (va tham)) truc van dung tai ((cuu tre) or (cau tren))*.