Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dat tren » dat trong, dua tren
tinh vai » tinh va, tinh hai, tinh bai
hieu van » hieu va, thien van, lieu va
cau luc » cau truc, cau phuc
vai dat » cai dat, va dat, van dat
va tinh » may tinh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cam luc » cam xuc

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) or (thuoc sach)) ky nang xa hoi. hieu van ((cam luc) or (cau luc)) va tinh vai dat tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky nang xa hoi. hieu van ((cam luc) OR (cau luc)) va tinh vai dat tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky nang xa hoi. hieu van ((cam luc) or (cau luc)) va tinh vai dat tren*.