Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
thi nang » thi cong, ki nang, thi hanh
nang cac » nang cao, bang cac, hang cac
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
tuc cua » thuc cua, tac cua, luc cua
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
tuc ca » tuc cac, tuc xa, tuc co
dan vi » doan vi, don vi, dan va

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 hoa. thi nang cac ((tuc ca) OR (tuc cua)) dan vi ((cau theo) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ma hoa. thi nang cac ((tuc ca) OR (tuc cua)) dan vi ((cau theo) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ma hoa. thi nang cac ((tuc ca) OR (tuc cua)) dan vi ((cau theo) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoa. thi nang cac ((tuc ca) OR (tuc cua)) dan vi ((cau theo) or (cua tre))*.