Perhaps you should try some spelling variations:
qua thanh » quan thanh, cua thanh, qua than
qua tham » qua cham, qua than, quan pham
hanh doi » thanh doi, hanh noi, hang doi
doi cua » dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
lang ha » long ha
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tu ((nang x) or (lang ha)) hoi. hieu ((qua tham) OR (qua thanh)) duc va hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((nang x) OR (lang ha)) hoi. hieu ((qua tham) OR (qua thanh)) duc va hanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu ((nang x) or (lang ha)) hoi. hieu ((qua tham) OR (qua thanh)) duc va hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu ((nang x) or (lang ha)) hoi. hieu ((qua tham) OR (qua thanh)) duc va hanh doi cua tre*.