Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va tinh » may tinh
cau tre » cau treo, cau tra, cuu tre
ve cho » ve co, ve che, de cho
cho xu » chao xu, choi xu, cho xa

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 xa hoi. hieu ve cho xu ((va tinh) or (van dich)) va ((cau tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu ve cho xu ((va tinh) OR (van dich)) va ((cau tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. hieu ve cho xu ((va tinh) or (van dich)) va ((cau tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu ve cho xu ((va tinh) or (van dich)) va ((cau tre) OR (cau tren))*.