Perhaps you should try some spelling variations:
nang cac » nang cao, bang cac, nang cap
cau treo » cau theo, cau tren, cau triet
hang cac » hang ca, hang cau, bang cac
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
tuc ca » tuc cac, tuc cua, tuc xa
ca dan » cac dan, ca dao
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 hoi. thi ((nang cac) OR (hang cac)) tuc ca dan vi ((cau treo) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ma hoi. thi ((nang cac) OR (hang cac)) tuc ca dan vi ((cau treo) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ma hoi. thi ((nang cac) OR (hang cac)) tuc ca dan vi ((cau treo) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoi. thi ((nang cac) OR (hang cac)) tuc ca dan vi ((cau treo) or (cua tre))*.