Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thi hang » thi hanh, thi hong, thi thanh
dung van » duong van, dung va, dang van
thi nang » thi cong, ki nang, thi hanh
duc van » duc va, duc tan, duc manh
te sach » toc sach
van cac » van hac, van cau, van bac
cho hoc » co hoc, khoa hoc
cua cau » cua cac, cua chu, cua cay
vi cua » vai cua, di cua

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 ((thi hang) OR (thi nang)) cho hoc. hieu van cac ((duc van) or (dung van)) hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((thi hang) OR (thi nang)) cho hoc. hieu van cac ((duc van) OR (dung van)) hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((thi hang) OR (thi nang)) cho hoc. hieu van cac ((duc van) or (dung van)) hanh vi cua cau*".