Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
chua tre » chua tri, cua tre, chua trieu
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van cam » van lam, van cau, van dam
hanh va » hang va, hanh vi
va chua » vua chua, ca chua, va chu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang xa hoi. thien ((van cam) or (van nam)) ((duc va) or (thuc dan)) hanh va chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. thien ((van cam) OR (van nam)) ((duc va) OR (thuc dan)) hanh va chua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. thien ((van cam) or (van nam)) ((duc va) or (thuc dan)) hanh va chua tre*.