Perhaps you should try some spelling variations:
giang van » dang van, gian dan, giang day
hoang van » hang va
hieu quan » hieu qua, lieu quan, thien quan
quan cau » quang cao, toan cau, quan ha
tu sach » thu sach, su sach, te sach
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua
cua te » cua tu

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 y ((giang van) or (hoang van)) hoa. hieu quan cau truc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((giang van) OR (hoang van)) hoa. hieu quan cau truc va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((giang van) or (hoang van)) hoa. hieu quan cau truc va hanh vi cua te*.