Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
hang hai » hoang hai, hang tai, thanh hai
van hang » van khang, van hoang, van thang
hai cuu » hai cua, hai chu, hai cuc
kham lo » pham lao
vu kham » vu khanh
hieu vu » hieu va, hieu ve, hieu su
cuu tre » cua tre, cau tren, cau treo
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, me hoi
lo van » le van, vo van, so van

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) or (thuoc sach)) ty nang ((ma hoi) or (ma hoa)). hieu vu kham lo van hang hai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ty nang ((ma hoi) OR (ma hoa)). hieu vu kham lo van hang hai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuoc sach)) ty nang ((ma hoi) or (ma hoa)). hieu vu kham lo van hang hai cuu tre*.