Perhaps you should try some spelling variations:
hieu thien » hieu hien, chieu chien, dieu khien
thien cac » hien cac, thien cau, thieu cac
truc ban » thuc ban, truc dan, truc van
tuc ban » thuc ban, tu ban, tuc dan
su sach » so sach, vu sach
van hoc » van hoa
van hoi » van hoa, van hoe, van loi
y lang » o lang, _ lang, tay lang
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: su sach y lang ((van hoi) OR (van hoc)). hieu thien cac ((tuc ban) or (truc ban)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y lang ((van hoi) OR (van hoc)). hieu thien cac ((tuc ban) OR (truc ban)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y lang ((van hoi) OR (van hoc)). hieu thien cac ((tuc ban) or (truc ban)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: su sach y lang ((van hoi) OR (van hoc)). hieu thien cac ((tuc ban) or (truc ban)) hanh vi cua te*.