Perhaps you should try some spelling variations:
man tinh » may tinh, ban tinh, quan tinh
thu nang » thi nang, thu bang, tho nang
thu hang » thi hang, thuc hanh, thu huong
hieu van » hieu va, thien van, lieu va
hac nuoc » hoc nuoc, cac nuoc, phap nuoc
nuoc man » nuoc mat, nuoc san, nuoc dan
tu sach » thu sach, su sach, te sach
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
van hac » van hoc, van ha, van hai

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 ((thu nang) or (thu hang)) xa hoi. hieu van hac nuoc man tinh ((vai cua) OR (lai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thu nang) OR (thu hang)) xa hoi. hieu van hac nuoc man tinh ((vai cua) OR (lai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((thu nang) or (thu hang)) xa hoi. hieu van hac nuoc man tinh ((vai cua) OR (lai cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((thu nang) or (thu hang)) xa hoi. hieu van hac nuoc man tinh ((vai cua) OR (lai cua)) te*.