Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
hanh hai » thanh hai, nhanh hai, hang hai
van hanh » van thanh, ban hanh, van anh
hai cuc » tai cuc, hai cua, thai cua
kham lo » pham lao
vu kham » vu khanh
hieu vu » hieu va, hieu ve, hieu su
cuc tre » duc tre, cua tre, cuu tre
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 hanh hai cuc 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 hanh hai cuc 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 hanh hai cuc tre*.