Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hang vai » hang va, hang tai, hang hai
ban hang » ngan hang
vien cac » vien bach, vien dai, vien da
sach ty » sach y, sach tu, sach thu
cuu tre » cua tre, cau tren, cau treo
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ve cac » va cac
ly ban » uy ban, lo ban, ly bai
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 ty nang ma hoi. hieu ((ve cac) OR (vien cac)) ly ban hang vai ((cuu tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ma hoi. hieu ((ve cac) OR (vien cac)) ly ban hang vai ((cuu tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ma hoi. hieu ((ve cac) OR (vien cac)) ly ban hang vai ((cuu tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoi. hieu ((ve cac) OR (vien cac)) ly ban hang vai ((cuu tre) or (cua triet))*.