Perhaps you should try some spelling variations:
hoc duoc » hoc nuoc, hoa duoc
ty hoang » ty hang, huy hoang, thi hoang
hoang xa » hoang ha, hoang va, hoang xuan
hanh vai » hanh vi, hanh va, hanh tai
hoc dung » hoc ung, hoc dan, tac dung
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
hieu va » lieu va
cua cu » cua chu, cua cau, cua su

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 ty hoang xa hoi. ((hieu va) OR (hieu qua)) ((hoc duoc) or (hoc dung)) va hanh vai cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty hoang xa hoi. ((hieu va) OR (hieu qua)) ((hoc duoc) OR (hoc dung)) va hanh vai cua cu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty hoang xa hoi. ((hieu va) OR (hieu qua)) ((hoc duoc) or (hoc dung)) va hanh vai cua cu*".