Perhaps you should try some spelling variations:
trung va » truong va, trang va, trung ha
cau tren » cu tren, dau tren, ca tren
luc hoc » duoc hoc
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach kem
truc va » thuc va, thuc vat
hanh ve » hanh vi, hanh va, hanh kem
ve chat » va chat, van chat
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (sach ty)) nang luc hoc. hieu ve chat ((truc va) OR (trung va)) hanh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang luc hoc. hieu ve chat ((truc va) OR (trung va)) hanh ve cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sach ty)) nang luc hoc. hieu ve chat ((truc va) OR (trung va)) hanh ve cau tren*".