Perhaps you should try some spelling variations:
hieu cao » chieu cao, hieu cac, kieu cao
hoc sach » hoc sinh, hoc cac, hoc anh
hanh lam » thanh lap, hanh kem, hanh va
tang van » dang van, hoang van, trong van
hieu ca » hieu cac, hieu cua, hieu va
lam cua » nam cua, lam chat
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
van hoc » van hoa
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cuu tre, cua triet
xu va » xu van, tu va, su va

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 (hoc sach)) ky tang van hoc. ((hieu cao) OR (hieu ca)) chao xu va hanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (hoc sach)) ky tang van hoc. ((hieu cao) OR (hieu ca)) chao xu va hanh lam cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (hoc sach)) ky tang van hoc. ((hieu cao) OR (hieu ca)) chao xu va hanh lam cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) ky tang van hoc. ((hieu cao) OR (hieu ca)) chao xu va hanh lam cua tre*.