Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
thi van » thi lan, thi hanh, thi nang
van lam » van nam
thuc va » thuc vat, thuc dan, thuc day
san cua » sang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
tuc va » truc va, duc va, thuc vat
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. thi van lam ((((tuc va) OR (thuc va))) or (tuc xa)) thanh san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. thi van lam ((((tuc va) OR (thuc va))) OR (tuc xa)) thanh san cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. thi van lam ((((tuc va) OR (thuc va))) or (tuc xa)) thanh san cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. thi van lam ((((tuc va) OR (thuc va))) or (tuc xa)) thanh san cua tre*.