Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » dau tren, ca tren, cau treo
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va pham » van pham, va phat, va phap
pham tu » phan tu, pham thi, pham tai
va hanh » van hanh, va thanh, va danh
cu tren » tu tren, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. lieu va pham tu va hanh vi ((cau tren) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. lieu va pham tu va hanh vi ((cau tren) OR (cu tren)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. lieu va pham tu va hanh vi ((cau tren) or (cu tren))*.