Perhaps you should try some spelling variations:
hanh trinh » canh tranh
theo sach » thuoc sach, te sach, theo lich
hieu cach » hieu cac, chieu sach, hieu ca
lang cong » dang cong, bang cong, hang cong
cong tinh » cong trinh, cong vinh, long tinh
toan ban » van ban
va lang » va nang, hoa lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((theo sach) or (hieu cach)) - ((hanh trinh) or (hanh chinh)) va lang cong tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((theo sach) OR (hieu cach)) - ((hanh trinh) OR (hanh chinh)) va lang cong tinh toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((theo sach) or (hieu cach)) - ((hanh trinh) or (hanh chinh)) va lang cong tinh toan ban*.