Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
te sach » toc sach
tinh ve » trinh ve, tinh ven, dinh ve
va tinh » may tinh
cam luc » cau luc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thu ((nang xa) OR (nang ma)) hoi. hieu ve ((cam luc) or (cam xuc)) va tinh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu ((nang xa) OR (nang ma)) hoi. hieu ve ((cam luc) OR (cam xuc)) va tinh ve cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu ((nang xa) OR (nang ma)) hoi. hieu ve ((cam luc) or (cam xuc)) va tinh ve cua tre*".