Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nang hoa » nang hoat, hang hoa, nang hoc
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
hoa hoi » khoa hoi, hoa hoc, hoa doi
ca tren » cau tren, cu tren, la tren
y nang » ky nang, ly nang, v nang

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)) y nang hoa hoi. hieu ve cham duc va hanh vi ((cua tre) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) y nang hoa hoi. hieu ve cham duc va hanh vi ((cua tre) OR (ca tren)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) y nang hoa hoi. hieu ve cham duc va hanh vi ((cua tre) or (ca tren))*.