Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
tay lang » tay tang, tay quang, tham lang
tai lang » tai cong, thi lan, tai san
hieu ke » hieu kem, chieu ke, hieu ky
hanh di » hanh vi, hanh de, hang di
hoc vat » hoc va, hoc viet, thuc vat
cau hoc » cau hoi, cau hoa, cao hoc
tu xach » tu hach, tu sach
tu cach » tu cac
ke cau » ket cau
di cua » dai cua, doi cua, de cua
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu xach) OR (tu cach)) ((tay lang) OR (tai lang)) ha noi. hieu ke cau hoc vat hanh di cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu xach) or (tu cach)) ((tay lang) OR (tai lang)) ha noi. hieu ke cau hoc vat hanh di cua te~".
• Adding a wildcard symbol may retrieve word variants: ((tu xach) or (tu cach)) ((tay lang) OR (tai lang)) ha noi. hieu ke cau hoc vat hanh di cua te*.