Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
cac lop » cac hop, cac loai
nang xa » nang x, nang ma, mang xa
vai cua » dai cua, hai cua, lai cua
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
cac lo » cac co, cac bo, cac ho
cua te » cua tu

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 ky ((nang xa) or (lang xa)) hoi. hieu hien ((cac lo) OR (cac lop)) va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu hien ((cac lo) OR (cac lop)) va hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (lang xa)) hoi. hieu hien ((cac lo) OR (cac lop)) va hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (lang xa)) hoi. hieu hien ((cac lo) OR (cac lop)) va hanh vai cua te*.