Perhaps you should try some spelling variations:
chau tre » chay tren, chau tho, cau tra
hanh lam » thanh lap, hanh kem, hanh va
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nha hoc » nha thuoc, khoa hoc, nha nuoc
cho tre » cho thue, khoe tre
hieu vu » hieu va, hieu ve, hieu su
ty hang » ly hang, ty xang, thi hang
ha hoc » hoa hoc, va hoc, ha hoa
hang x » nang x, hoang xa, chang xu

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 hang x ho. hieu vu ((ha hoc) OR (nha hoc)) van hanh lam ((chau tre) or (cho tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang x ho. hieu vu ((ha hoc) OR (nha hoc)) van hanh lam ((chau tre) OR (cho tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty hang x ho. hieu vu ((ha hoc) OR (nha hoc)) van hanh lam ((chau tre) or (cho tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang x ho. hieu vu ((ha hoc) OR (nha hoc)) van hanh lam ((chau tre) or (cho tre))*.