Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cham duc » pham duc, cham soc, pham duy
cua tre » cua te, cuu tre, cua triet
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
sang ma » tang ma, nang ma, sang tao
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van

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) or (sang ma)) hoi. hieu ve cham duc va hanh di ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (sang ma)) hoi. hieu ve cham duc va hanh di ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (sang ma)) hoi. hieu ve cham duc va hanh di ((cua tre) or (cau tren))*.