Perhaps you should try some spelling variations:
te sach » toc sach
hanh de » hanh ve, hanh kem
luu van » cuu van, luan van, luu hanh
luc van » luoc van, duc van, luc va
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
de cua » le cua, te cua, dieu cua
ve cam » ve cham, ve cac, va cam

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 ky ((nang xa) or (nang x)) hoi. hieu ve cam ((luc van) OR (luu van)) hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang xa) OR (nang x)) hoi. hieu ve cam ((luc van) OR (luu van)) hanh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang xa) or (nang x)) hoi. hieu ve cam ((luc van) OR (luu van)) hanh de cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang xa) or (nang x)) hoi. hieu ve cam ((luc van) OR (luu van)) hanh de cua tre*.