Perhaps you should try some spelling variations:
hoc duoc » hoc nuoc, hoa duoc, hoc dung
tinh lai » tinh lao, tinh hai, minh lai
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
va tinh » may tinh
duoc va » nuoc va, duc va, duoc ma
cuu tre » cau tren, cau treo
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
ve hoc » te hoc, va hoc, vi hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((nang xa) or (nang x)) hoi. hieu ve hoc duoc va tinh lai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang x)) hoi. hieu ve hoc duoc va tinh lai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang x)) hoi. hieu ve hoc duoc va tinh lai ((cua tre) or (cuu tre))*.