Perhaps you should try some spelling variations:
tay lang » tai lang, tay tang, tay quang
pham thu » pham thuc, pham thi, pham tu
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
thu van » thuc van, thuy van, tu van
y lang » o lang, _ lang, yen 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) or (tay lang)) xa hoi. hieu va pham thu van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y lang) OR (tay lang)) xa hoi. hieu va pham thu van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ((y lang) or (tay lang)) xa hoi. hieu va pham thu van hanh vi cua te*.