Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
dan lai » dan loai, dan lap, dan lat
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau

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 cao hoi. hieu ve cam xuc va dan lai ((cua tre) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang cao hoi. hieu ve cam xuc va dan lai ((cua tre) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang cao hoi. hieu ve cam xuc va dan lai ((cua tre) or (dau tren))*.